/*
 * MIDI Control Change
 */

#include <MIDI.h>

MIDI_CREATE_DEFAULT_INSTANCE();

#define potPin       A0 // define peripherals
#define button1       2
#define button2       3
#define led          10

int potValue =        0;
int volume1Prev;
int button1State;  
int button2State; 
int button1Prev =   LOW;
int button2Prev =   LOW;  

int ledState =     HIGH;

long time =           0;
long debounce =     200;

void setup() {
  MIDI.begin();
  Serial.begin(115200);
  
  pinMode(button1,  INPUT);
  pinMode(button2,  INPUT);
  pinMode(led,     OUTPUT);
}

void loop() {
  potValue = analogRead(potPin);
  button1State = digitalRead(button1);
  button2State = digitalRead(button2);

  int volume1Value = map(potValue, 0, 1023, 0, 127);

  if (button1State == HIGH && button1Prev == LOW && millis() - time > debounce) {
    MIDI.sendControlChange(63, 127, 1);
    time = millis();
  }

  if (button2State == HIGH && button2Prev == LOW && millis() - time > debounce) {
    MIDI.sendControlChange(62, 127, 1);
    time = millis();
  }

  if (volume1Value != volume1Prev && millis() - time > debounce) {
    MIDI.sendControlChange(72, volume1Value, 1);    
    time = millis();
  }

  volume1Prev = volume1Value;
  button1Prev = button1State;
  button2Prev = button2State;
}